Abstract
The quantification of automotive engine components noise is significant for high-efficiency engine system development, which meets great challenges for engine bay on-site measurement. A major challenge is that the sizes of engine components are small which radiate high frequency noise (beyond 5000Hz); the classic Near-field acoustical holography (NAH) has great difficulties to work at this scenario. For the sake of improving the spatial resolution of imaging, sequential measurements are investigated, which is a solution to achieve large array and/or high microphone density by moving sequentially a small prototype array to scan the object of interest. In comparison to a large array and/or high microphone density array that can acquire simultaneously all the information of the spectral matrix, non-synchronous sequential measurements can only acquire a block diagonal spectral matrix, while the cross-spectra between the sequential measurements remain unknown due to the missing phase relationships between consecutive positions; a propagation based Fast Iterative Shrinkage Thresholding Algorithm (FISTA) is proposed in this paper to achieve the non-synchronous sequential measurements, and the proposed approach is applied for the purpose of engine components noise quantification in engine bay on-site measurement, which is validated with specimen of industry in laboratory.
Original language | English |
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Pages | 7524-7532 |
Number of pages | 9 |
State | Published - 21 Aug 2016 |
Externally published | Yes |
Event | 45th International Congress and Exposition on Noise Control Engineering: Towards a Quieter Future, INTER-NOISE 2016 - Hamburg, Germany Duration: 21 Aug 2016 → 24 Aug 2016 |
Conference
Conference | 45th International Congress and Exposition on Noise Control Engineering: Towards a Quieter Future, INTER-NOISE 2016 |
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Country/Territory | Germany |
City | Hamburg |
Period | 21/08/16 → 24/08/16 |
Keywords
- Non-synchronous sequential measurements
- Processing by microphone arrays
- Propagation FISTA